Is Claim of 200+ J6 Undercover Feds a Kookie Conspiracy Theory?

Congressman Clay Higgins has claimed that over 200 undercover FBI agents infiltrated the crowd at the Capitol on J6. Is he right or is that just a kooky conspiracy theory? As you can see, the FBI is VEHEMENTLY denying that there were undercover feds present that day. The absolute certainty of their flat out denials could give one pause over accepting that the claim of over 200 feds present is correct.